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Electronic device with noise-cancelling force sensor

A technology for electronic equipment and noise, applied in electronic switches, branch equipment, instruments, etc., can solve the problems of reducing the performance of strain gauges, erroneous measurement results, etc.

Active Publication Date: 2013-06-19
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

System noise such as capacitively coupled noise from the user's body can degrade strain gauge performance if care is not taken
Improper handling of strain gauges can produce erroneous strain gauge measurements

Method used

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  • Electronic device with noise-cancelling force sensor
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  • Electronic device with noise-cancelling force sensor

Examples

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Embodiment Construction

[0024] such as figure 1 The electronics of device 10 may have one or more strain gauges. Strain gauges in devices such as device 10 may be used to gather user input. For example, strain gauges may be used as user input devices that are sensitive to pressure from a user's finger or other external object.

[0025] The strain gauge structure may be mounted to an exposed device surface, eg, a portion of a display, a housing side wall, other housing structures such as rear housing wall structures, or other device structures. By using this type of mounting location, the strain gauge structure can be used to implement an input device that sits flush with an exposed surface of the device 10 .

[0026] Examples of input devices that may be formed using strain gauge structures include menu buttons, volume buttons, power buttons, buttons with one or more other functions, keyboard keys, sliding input and output devices (e.g., for continuous volume adjustment or other control function s...

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PUM

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Abstract

An electronic device may have a housing in which components such as a display are mounted. A strain gauge may be mounted on a layer of the display such as a cover layer or may be mounted on a portion of the housing or other support structure. The layer of material on which the strain gauge is mounted may be configured to flex in response to pressure applied by a finger of a user. The strain gauge may serve as a button for the electronic device or may form part of other input circuitry. A differential amplifier and analog-to-digital converter circuit may be used to gather and process strain gauge signals. The strain gauge may be formed form variable resistor structures that make up part of a bridge circuit that is coupled to the differential amplifier. The bridge circuit may be configured to reduce the impact of capacitively coupled noise.

Description

technical field [0001] This application relates to electronic devices and, in particular, to electronic devices having strain gauges. Background technique [0002] Strain gauges can be used as part of the input device to gather user input. System noise, such as capacitively coupled noise from the user's body, can degrade the performance of the strain gauge if care is not taken. Improper handling of strain gauges can produce erroneous strain gauge measurements. [0003] Accordingly, it would be desirable to be able to provide improved strain gauges for use in electronic devices. Contents of the invention [0004] An electronic device may have a housing in which components such as a display are mounted. The display can be covered by a display cover. The display cover layer may be formed from glass, plastic, or other transparent materials. [0005] The strain gauges may be mounted on the display cover, on a portion of the housing, or on other support structures within th...

Claims

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Application Information

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IPC IPC(8): G01L1/22H04M1/72466H04M1/72469
CPCH03K17/9625G06F3/0414G06F3/04182G06F3/044G06F3/047G06F3/045H04M1/72466H04M1/72469G01L1/22G06F3/0418G01L1/2262G06F2203/04102G06F2203/04105H04M1/0266
Inventor 杨冰瑞M·P·格朗杉纳S·P·豪泰灵
Owner APPLE INC
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